Subject: [PWE3] PWE3 WG response to Q7/13 on "pseudowire" and definition of stitching function

From: Stewart Bryant <[email-masked]>
Date: Mon, 07 Jan 2008 16:43:15 +0000

To
[email-masked] <[email-masked]>
Georges Sebek <[email-masked]>
[email-masked] <[email-masked]>

CC
IETF PWE3 WG <[email-masked]>
Internet Area AD <[email-masked]>
Internet Area AD <[email-masked]>
PWE3 Co-chair <[email-masked]>
PWE3 Co-chair <[email-masked]>
[email-masked]
Yaakov Stein <[email-masked]>

For Action

Please bring this liaison to the attention of Q7/13.

Thank you for your liaison entitled

Use of term "pseudowire" and definition of stitching function
<https://datatracker.ietf.org/liaison/329/>
https://datatracker.ietf.org/liaison/329/

We would like to thank you for the information on your
draft new Recommendation.

We agree that what you call a Generic Adaptation Layer
(GAL) is either a single segment PW, or a multisegment
PW. We would appreciate your using the term "pseudowire"
(PW), and believe that standardizing terminology
is best for the industry.

We understand that you have included normative
references to the necessary IETF RFCs. We request
that you include a clear statement that there is
no intention to change the behavior defined
in the normative IETF RFCs, and in the event
conflicting definitions, the IETF RFC is the
authoritative source.

In addition, although the focus of this document
is the multi-segment case, we advise adding (for
reference) figures prior to Figures 6-1 and 6-2
depicting the single segment case.

Furthermore, we feel it would be useful to specifically
state that the subnetwork connection inside the S-IWF
can potentially modify the PW label. Although this
is implicit in the switching capability at the PW
layer, this is the new feature of the MS-PW.

Regarding your question about the use of a single S-PE
or a pair of S-PEs connected by a simple link, we feel
that both cases are possible. In the MS-PW architecture
draft (draft-ietf-pwe3-ms-pw-arch-03.txt) we differentiate
between the intra-provider and inter-provider cases.
The inter-provider reference model of figure 5 of this
draft maps to your Figure 6-3 when "PW segment 2"
is a link. On the other hand, for the intra-provider
case, or when two providers have a relationship of trust,
the single S-PE case is feasible.

Regards

Stewart Bryant & Danny McPherson
IETF PWE3 Co-chairs

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